Cut the grapefruits into 4 wedges and carefully remove the peel from each wedge. Cut the peels into chunks or long strands.

Place the grapefruit peels in a pot covered with about 1 inch of water. Bring to a boil, then strain out the peels. Repeat this boiling process four times.

In the same pot, combine 4 cups of water and 4 cups of sugar, stirring until dissolved. Add the grapefruit peels and bring to a boil.

Let the mixture boil for about 30 minutes until the zest becomes translucent. Strain out the mixture over a heat-proof bowl to keep the syrup.

In a separate bowl, place 1 cup of sugar and add the hot grapefruit peels. Mix thoroughly and lay them out on a plate to cool down.